package threading;

/**
 * @author 徐志荣
 * @date 2023/3/19 14:39
 */
//懒汉模式~
class  SingletonLazy{
   volatile private static SingletonLazy instance = null;
    public static SingletonLazy getInstance(){
        if(instance == null) {
            synchronized (SingletonLazy.class) {
                if (instance == null) {
                    instance = new SingletonLazy();
                }
            }
        }
        return instance;
    }
    private SingletonLazy(){}
}
public class ThreadDemo18 {
    public static void main(String[] args) {
        SingletonLazy s1 = SingletonLazy.getInstance();
        SingletonLazy s2 = SingletonLazy.getInstance();
        System.out.println(s1 == s2);
    }
}
